In the summer of 2009, as she was covering the popular uprisings in Tehran for the New York Times, Iranian journalist Nazila Fathi received a phone call. "They have given your photo to snipers," a government source warned her. Soon after, with undercover agents closing in, Fathi fled the country with her husband and two children, beginning a life of exile.

In The Lonely War, Fathi interweaves her story with that of the country she left behind, showing how Iran is locked in a battle between hardliners and reformers that dates back to the country's 1979 revolution. Fathi was...